In the final multivariable Cox regression model, the following factors were significant: the female gender (median PFS: 26 versus 50 months, p < 0.001, HR: 0.23), a primitive tumor diameter ≤ 5 cm (median PFS: 27 versus 63 months, p = 0.017, HR: 3.39), a PMN leucocyte > 7.5 × 109 (median PFS: 24 versus 49 months, p = 0.006, HR: 0.27) and the absence of KIT Exon 11 Del or Delins 557/558 (median PFS: 24 versus 45 months, p < 0.001, HR: 0.12). Here, KIT is linked to neoplasm.